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Note 10 - Common Stock and Stock-based Compensation Plans (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 14, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2021 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number (in shares) | [2] |  | 109,000 | [1] |  | 109,000 | [1] |  |  | 126,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number (in shares) | [2],[3] |  | 109,000 |  |  | 109,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Grants in Period (in shares) |  |  | 0 |  | 0 | 0 | [2] |  |  |  |
Non-employee Director [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Annual Vesting, Percentage |  |  | 25.00% |  |  | 25.00% |  |  |  |  |
The2011 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights Vesting Percentage, Year One |  |  | 25.00% |  |  | 25.00% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Vesting Period (Month) |  |  |  |  |  | 36 months |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number (in shares) |  |  | 108,250 |  |  | 108,250 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number (in shares) |  |  | 108,250 |  |  | 108,250 |  |  |  |  |
Maximum [Member] | The2011 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 4 years |  |  |  |  |
Stock Appreciation Rights (SARs) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards Granted |  |  |  |  |  |  |  |  |  |  | 400.00%
Percentage of Stock Appreciation Rights Units Subject to Grant |  |  |  |  |  | 75.00% |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Vesting on February 17, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 33.40% |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Vesting on February 17, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 33.30% |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Vesting on February 17, 2025 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 33.30% |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Non-employee Director [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  | 2 years | 1 year |  |
Restricted Stock Units (RSUs) [Member] | Employees [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 3 years |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | The2011 Stock Incentive Plan [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 9,935 |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | The2011 Stock Incentive Plan [Member] | Executive Vice President, Worldwide Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 5,961 |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | The2011 Stock Incentive Plan [Member] | Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 7,451 |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | The2011 Stock Incentive Plan [Member] | Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 5,961 |  |  |  |  |  |  |  |  |
Performance Share Units [Member] | The2011 Stock Incentive Plan [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 14,903 |  |  |  |  |  |  |  |  |
Performance Share Units [Member] | The2011 Stock Incentive Plan [Member] | Executive Vice President, Worldwide Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 3,974 |  |  |  |  |  |  |  |  |
Performance Share Units [Member] | The2011 Stock Incentive Plan [Member] | Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 4,969 |  |  |  |  |  |  |  |  |
Performance Share Units [Member] | The2011 Stock Incentive Plan [Member] | Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 3,974 |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded, Percentage |  | 20.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Vesting on February 17, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  | 33.40% |  |  |  |  |
Short-Term Executive PSUs [Member] | Vesting on February 17, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  | 33.30% |  |  |  |  |
Short-Term Executive PSUs [Member] | Vesting on February 17, 2025 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  | 33.30% |  |  |  |  |
Short-Term Executive PSUs [Member] | Goals One [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 50.00% |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage |  | 90.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Goals One [Member] | Full Vesting Based on The Achievement of 2022 License Target [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 50.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Goals One [Member] | Increase in Eligible PSUs, Percent [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Conditional Increase in Shares, Percentage |  | 2.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Goals Two [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 50.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Goals Two [Member] | Increase in Eligible PSUs, Percent [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Conditional Increase in Shares, Percentage |  | 2.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Goals Two [Member] | Full Vesting Based on The Achievement of Positive Shareholder Return [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 50.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Goals Two [Member] | Vesting Based on Actual Return Being at Least 90 Percent of S&P500 Index [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage |  | 90.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Goals Two [Member] | Vesting Based on Actual Return In Excess of 100 Percent of S&P500 Index [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage |  | 100.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded (in shares) |  | 2,981 |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Executive Vice President, Worldwide Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded (in shares) |  | 795 |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded (in shares) |  | 994 |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded (in shares) |  | 795 |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Maximum [Member] | Goals One [Member] | Vesting Based on Achievement In Excess of 90 Percent [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage |  | 110.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Maximum [Member] | Goals Two [Member] | Vesting Based on Actual Return Being at Least 90 Percent of S&P500 Index [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 99.00% |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage |  | 99.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Maximum [Member] | Goals Two [Member] | Vesting Based on Actual Return In Excess of 100 Percent of S&P500 Index [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage |  | 110.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Minimum [Member] | Goals One [Member] | Vesting Based on Achievement In Excess of 90 Percent [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage |  | 1.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Minimum [Member] | Goals Two [Member] | Vesting Based on Actual Return Being at Least 90 Percent of S&P500 Index [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 91.00% |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage |  | 90.00% |  |  |  |  |  |  |  |  |
Short-Term Executive PSUs [Member] | Minimum [Member] | Goals Two [Member] | Vesting Based on Actual Return In Excess of 100 Percent of S&P500 Index [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage |  | 1.00% |  |  |  |  |  |  |  |  |
RSUs and PSUs [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 413,619 |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 25,099 |  |  | $ 25,099 |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 1 year 8 months 12 days |  |  |  |  |
[1] | Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 108,250 shares of the Company’s common stock issuable upon exercise.
[2] | The SAR units are convertible for a maximum number of shares of the Company’s common stock equal to 75% of the SAR units subject to the grant.
[3] | Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 108,250 shares of the Company’s common stock issuable upon exercise.

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